Combination oven



FIG. 1 is a front perspective view of a combination oven showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a top view thereof.

The broken lines depicting the vertical seam and the elongated racetrack-shaped region within the shaded area form no part of the claimed design. The broken lines depicting the remainder of the combination oven form no part of the claimed design. 

CLAIM The ornamental design for a combination oven, as shown and described. 